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This list of frequently asked questions will be updated as new questions arise. If you don't find the answer to your question here, please don't hesitate to get in touch with me.
PreviewQt is developed as open-source, meaning its source code is freely available to everyone and can be obtained by everyone for free. It is licensed under the GPL v2 or later, meaning that anybody can use and modify PreviewQt, as long as this license is kept (more info on the GPL v2 here). I decided to publish PreviewQt as free open-source software as I have been the happy user of numerous open-source projects myself, and this is a way I can give something back to the community.
You can find out what version you are running by executing previewqt --version on the command line, or by checking the About window in PreviewQt (shortcut: Ctrl + I).
An overview of the configuration used for your build of PreviewQt can be obtained either by running previewqt --show-info from the command line or by clicking on the logo in the About window (shortcut: Ctrl + I).
Although Windows 7 is not officially supported by PreviewQt (or by Qt6 for that matter), you might have success running the latest version of PreviewQt using the VxKex Windows 7 API Extensions. For questions and support of VxKex please refer to its git repository.
Please note that Windows 7 has reached its end of life in early 2020 and does not receive any more security updates. It is highly recommended to upgrade to a newer operating system.
If you are using KDE's Dolphin file manager, then you're in luck: All you need to do is create a global shortcut for your window manager for the command previewqt --load-selected-file. Triggering your selected shortcut when a file is selected in Dolphin will open it directly in PreviewQt.
PreviewQt uses a variety of image libraries to render and show all kinds of images. The exact selection of supported image formats depends on which library has been enabled when your build of PreviewQt was done, and also on the versions of said libraries themselves. If you are missing some image formats in your build check that your running the latest version of PreviewQt and inform the maintainer who compiled your build of PreviewQt. If you built it yourself, make sure that all desired image libraries are enabled and found when running cmake.
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